JLG 10MSP Service Manual - Manual (Page 91)

SECTION 5 - MAST COMPONENTS
3121228 – JLG Lift – 5-9
Mast Section-1 - Disassembly
1. Remove the four (4) large screws (2 each side)
attaching the lift cylinder mounting block to mast
section-1. Slide the cylinder out of the mast section
and move to a suitable work surface.
2. At the top end of mast section-1, remove the pin
attaching the chain anchor block to the mast and
remove chain/anchor block assemblies from the
mast and lay aside.
3. Remove slide pads and shims from mast section-1,
if necessary.
Mast disassembly should now be complete.
5.9 CYLINDER DISASSEMBLY
(See Figure 5-3.)
1. Before disassembling the cylinder, clean away all
dirt and foreign substances from openings, particu-
larly the head area.
NOTE: Always protect the chrome surface of the cylinder
rod during assembly and disassembly. Any damage
to this surface will require replacement of the rod.
2. Extend the rod until the piston bottoms out against
the cylinder head.
3. Compress the head retraining ring enough to allow
the cylinder head to be removed.
4. Carefully slide the head/rod/piston assembly out of
the cylinder tube. A gentle tap on the head assembly
may be required to remove the head from the cylin-
der tube.
5. Place the head/rod/piston assembly on a surface
that will not damage the chrome.
6. Remove the piston locknut and separate the piston
from the rod.
7. Slide the head off the rod from the piston end.
NOTE: When removing the old seals use only blunt tools, be
sure there are no sharp edges that may damage the
seal grooves during removal. Scratching the groove
may cause by-pass.
8. Remove and discard all old seals.
Figure 5-3. Lift Cylinder Component Cross-Section.
1. Cylinder Rod 6. Apply Anti-Seize 10. Piston
2. Cylinder Head 7. Cylinder Tube 11. Wear Ring
3. Rod Wiper 8. Spacer 12. Piston O-Ring
4. Rod Seal 9. Piston Seal 13. Piston Lock Nut (a)
5. O-Ring
Note: (a) - Torque 100 - 120 ft. lbs.
1
3
4
5
6
8
9
12
10
11
13
2
7